@perfective/value v0.2.0-alpha

Value

The @perfective/value package provides functions to work with undefined and null values and utility types (similar to the TS NonNullable<T> to describe some of such values.

• Utility types:
  • type Defined<T> = T extends undefined ? never : T
  • type NotNull<T> = T extends null ? never : T
  • type Present<T> = T extends null | undefined ? never : T
  • type Absent<T> = T extends null | undefined ? T : never
• Type Guards:
  • isDefined<T>(value: T | undefined): value is T
  • isUndefined<T>(value: T | undefined): value is undefined
  • isNotNull<T>(value: T | null): value is T
  • isNull<T>(value: T | null): value is null
  • isPresent<T>(value: T | null | undefined): value is T
  • isAbsent<T>(value: T | null | undefined): value is null | undefined
• Handling void:
  • voidable<T>(value: T | void): T | null | undefined

Full documentation is available in the repository.